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 2.GQ Geiger Muller Counter
 replacing GMC200 tube SI 39G		  New Topic  Reply to Topic
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bifferidge

USA
34 Posts
Posted - 03/04/2014 :  19:53:37  Show Profile  Reply with Quote
hello my old GMC200 tube hada lightbulb screw at one end and it was easy to tell which is + and which is -ve. However my replacement tube SI 39G (#1057;#1048; 39#1043;) has positive at one end and negative at the other end. But I dont know which is which! Does it matter? There is a "+" sign slightly to one side ... but I am not confident enough to assume that means +ve... any suggestions?
Reply #1

ZLM

1261 Posts
Posted - 03/04/2014 :  22:22:08  Show Profile  Reply with Quote
The positive always goes to tube center and negative always goes tube shell.
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Reply #2

bifferidge

USA
34 Posts
Posted - 03/05/2014 :  19:40:31  Show Profile  Reply with Quote
Hi ZLM - thanks for tip - BUT I cannot identify which end is which - see picture?

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Reply #3

ZLM

1261 Posts
Posted - 03/06/2014 :  11:52:25  Show Profile  Reply with Quote
There is a + sign on the left side.
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Reply #4

bifferidge

USA
34 Posts
Posted - 03/06/2014 :  17:34:35  Show Profile  Reply with Quote
Hi ZLM - ha yes i did notice the + sign ... but as it was kindof in the middle I lacked confidence in assuming that means the positive was on the left side

I will extend the current wire and report back! Thanks for your help!
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